The caps on valve handwheels are often lost – does anyone have any good solutions?
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As the title suggests, I currently have an idea to weld the back cap directly onto it. This situation usually involves small valves – what do you all think?
Double-back cap, directly welded in place; pins are used for positioning on the screw
This phenomenon generally occurs during construction. If the device is put into operation after delivery, such a problem will not exist. So you won’t be able to pass the inspection after welding, so find a way to strengthen on-site inspections to prevent losses.
My approach is: for new valves, make sure to tighten the back cap before opening it for the first time.
It should be carried out in groups; if any group loses something, they will be severely punished!!!!!!!!!
If it’s welded in place, replacing it will be a hassle in case the copper sleeve gets damaged!
Use thread sealant, anaerobic type. . .
So easy—just one bottle of 502 glue is enough
It’s not easy to handle; we here regularly check and tighten it.
Keep the commonly used ones on, and increase the frequency of inspections; remove those that are not used frequently, so as to prevent unauthorized people from touching the valves.
Handling of valve back caps and copper sleeves coming loose: What are back caps and copper sleeves? Two nuts can be installed on the same bolt; by tightening the nut at the back, a self-locking effect is achieved. This method is generally used to prevent loosening in mechanical fasteners. This film takes the hand valve back cap and copper sleeve as examples. Copper sleeve, back cap – does the back cap fall off? The back cap on the manual valve can sometimes come off due to thread slippage or pipe vibration. It may cause unnecessary trouble during operations; during inspections, thorough checks must be carried out and issues addressed promptly. What is the purpose of a cap? The principle is simple: it’s the pressure between the two nuts that creates maximum friction, preventing the nuts from rotating. After the cap was removed, the manual valve could be closed but not opened; the threads of the handwheel did not engage tightly with those of the copper sleeve, and the handwheel failed to make proper contact with the copper sleeve, resulting in slippage. It cannot be opened; it can be closed. Replace the back cap (1). When it is necessary to open the manual valve, if the back cap comes off, replace it promptly – at this time the copper sleeve is in the fully closed position. Install shims and find a suitable back cap for installation. Gasket, copper sleeve fully closed – replace the back cap (2). The back cap came off while the handwheel was in the open position; as a result, it is not possible to close the hand valve. The thread of the handwheel engages with the thread of the bolt; it should not come into contact with the copper sleeve, as this can cause slipping. ? It is necessary to find a suitable tool or use hands to screw the copper sleeve to the fully closed position. Installation complete? Add the gaskets and install the handwheel; use a wrench to properly attach the cover. After installation, turn the handwheel and carefully check for any signs of slipping; only after confirming that everything is working properly may you leave the site.